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Consider already having a class called gradebook that manages a student's grades for a class, but you want to define the following member...
X796: getAverage for Gradebook Class in C++
Consider already having a class called gradebook that manages a student's grades for a class, but you want to define the following member function for it:
double getAverage(); // returns the average of all the current grades
Write the function getAverage, assuming the gradebook stores each grade in the following private member variable:
vector <double> book;
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